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ALPINE-CVE-2021-28701 PUBLISHED CVSS 7.800000190734863 HIGH

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Risk Scores

CVSS v3.1
7.800000190734863
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected Products

VendorProductVersions
Alpine:v3.21xen4.9.1-r3, 4.9.1-r2, 4.9.1-r1
Alpine:v3.18xen4.9.1-r3, 4.9.1-r2, 4.9.1-r1
Alpine:v3.17xen4.13.0-r4, 0, 4.0.1-r0
Alpine:v3.14xen4.2.1-r8, 4.9.1-r3, 4.9.1-r2
Alpine:v3.22xen4.9.1-r0, 4.10.0-r2, 4.9.1-r3
Alpine:v3.11xen4.9.0-r7, 4.7.0-r5, 4.7.1-r0
Alpine:v3.15xen4.2.0-r5, 4.2.0-r4, 4.2.0-r3
Alpine:v3.16xen4.4.2-r0, 0, 4.0.1-r0
Alpine:v3.19xen0, 4.9.1-r3, 4.9.1-r2
Alpine:v3.20xen4.10.0-r2, 4.10.0-r3, 4.10.1-r0
Alpine:v3.13xen4.11.0-r1, 4.9.1-r3, 4.9.1-r2
Alpine:v3.12xen4.9.1-r0, 4.9.0-r8, 4.9.0-r7
Alpine:v3.23xen4.3.2-r4, 4.3.3-r0, 4.4.1-r0

Timeline

References

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